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Technical content
Features
Bipolar IC with open-collector output Digital output, full TTL compatible Sensitive in visible and near IR range Transfer rate ≤ 5MBd Low switching threshold 2.2mm aperture holds standard 980/1000/2200μm plastic fi bers No fi ber stripping required Molded microlens for effi cient coupling Plastic Direct Fiber Connector housing (V-housing) Locking screw attached to the connector Interference-free transmission by the light-tight housing Transmitter and receiver can be positioned fl exibly No cross talk Auto insertable and wave solderable Supplied in tubes
Applications
Household electronics Power electronics Optical networks Application Literature AN # Description
5342 General information about the SFH series
with Selection Guide and recommendations regarding System Planning and Mounting
5341 Information about Basic and Special Circuits for
Transmitter and Receiver of the SFH series
Description
The SFH551/1-1 receiver is a transimpedance amplifi er with an integrated photodiode and TTL open-collector output stage. The active area of this detector combined with the molded microlens gives an effi cient coupling from the end of the polymer optical fi ber. This receiver enables data rates up to 5 MBd and works with the Avago SFH757 transmitter diode. The SFH551/1-1 is fully DC coupled and therefore no line code is needed. The internal Schmitt trigger ensures stable output states over the whole dynamic range. If light with intensity above the threshold level is coupled into the SFH551/1-1, the electrical output will be logical “low” and vice versa. With noisefree Vcc and GND, an undefi ned output signal is not possible. Nevertheless, the SFH551/1-1 must not be used without shielding from ambient light. If ambient light could reach the threshold level, the SFH551/1-1V component should be chosen. The plastic connector housing of the SFH V-series shields the ambient light perfectly. SFH series components are optimized for easy coupling. No fi ber stripping is required; just insert the cut fi ber into the selected SFH component.
Ordering Information
SFH551/1-1 and SFH551/1-1V Receiver with Digital Output Stage for Polymer Optical Fiber Applications Data Sheet SFH551/1-1 SFH551/1-1V Type Ordering Code SFH551/1-1 SP000063860 SFH551/1-1V SP000063855
Figure 1. Equivalent circuit diagram (simplifi ed) is very easy and extremely cost-eff ective. 2.2 mm polymer optical fi ber by an axial locking screw. ports. In critical applications a shorter distance is better.
Parameter Symbol Min Typ Max Unit Notes Figure Operating Temperature range T C -40 +85 °C Storage Temperature range T stg -40 +100 °C Supply Voltage Range without Damage V CC -0.5 15 V Soldering Temperature (2mm from case bottom, t≤5s) T S +260 °C Minimum Supply Voltage for Function V CC min 4V Minimum Pullup Resistance (Vcc=5.0V) R outmin 330 Ω 1 Output Voltage V O -0.5 15 V Output Current I C 50 mA Power Dissipation (Output) P O 100 mW Electrostatic Discharge Voltage Capability ESD 2000 V 1 Electrostatic Discharge Voltage Capability ESD 400 V 2 Notes: 1. ESD Capability for all Pins HBM(Human Body Model) according JESD22-A114 2. ESD Capability for all Pins MM (Machine Model) according JESD22-A115 Package V-housing Color SFH V-series components are color coded just like other Avago fi ber optic components. The SFH757V transmitter has a white colored housing; the SFH250V and SFH551/1- 1V receiver components have a black colored housing. This prevents mistakes while making connections. Product designation and date of manufacture are printed on the housing. Package V-housing mounting pins SFH V-series components have two pins that are electri- cally isolated from the inner circuit. The pins are only designed for mounting the V-housing to the PCB surface. This helps increase stability, which is needed during fi xing the fi ber end by the axial locking screw. The retention force between the soldered mounting pins and the V-housing of the SFH component is about 20 N (with a vertical exertion of force). This is an approximate value. Package V-housing axial locking screw Components of the SFH V-series are equipped with an axial locking screw for easy coupling to the unconnec- torized 2.2 mm polymer optical fi ber. The force that is necessary to pull a jammed fi ber out of the V-housing is typically 50 N (with a torque of 15 cNm for tightening the locking screw). This is an approximate value that is very dependent on the fi ber and torque combination. Package V-housing mounting pins Package V-housing axial locking screw
- PWSFH_output = PWopt_input + (tPLH – tPHL); PW = pulse width
- Switching times increase with temperature
- Measured with recommended Rpullup = 330Ω (see Figure 1)
- Sensitivity increase with temperature
- Limits valid for optical input power from -20dBm(mean) to -9dBm(mean)
- dBm(peak) = dBm(mean) + 3dB
- PWD ≤ 170ns; Input: Pattern “1010” , 5MBd
Figure 2. Typical corresponding optical input to electrical output signal